diff options
Diffstat (limited to 'vendor/OTPHP/Base32.php')
-rw-r--r-- | vendor/OTPHP/Base32.php | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/vendor/OTPHP/Base32.php b/vendor/OTPHP/Base32.php new file mode 100644 index 000000000..f0dc2f16b --- /dev/null +++ b/vendor/OTPHP/Base32.php @@ -0,0 +1,85 @@ +<?php + +namespace OTPHP; + +/** + * Encode in Base32 based on RFC 4648. + * Requires 20% more space than base64 + * Great for case-insensitive filesystems like Windows and URL's (except for = char which can be excluded using the pad option for urls) + * + * @package default + * @author Bryan Ruiz + **/ +class Base32 { + + private static $map = array( + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', // 7 + 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15 + 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23 + 'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31 + '=' // padding char + ); + + private static $flippedMap = array( + 'A'=>'0', 'B'=>'1', 'C'=>'2', 'D'=>'3', 'E'=>'4', 'F'=>'5', 'G'=>'6', 'H'=>'7', + 'I'=>'8', 'J'=>'9', 'K'=>'10', 'L'=>'11', 'M'=>'12', 'N'=>'13', 'O'=>'14', 'P'=>'15', + 'Q'=>'16', 'R'=>'17', 'S'=>'18', 'T'=>'19', 'U'=>'20', 'V'=>'21', 'W'=>'22', 'X'=>'23', + 'Y'=>'24', 'Z'=>'25', '2'=>'26', '3'=>'27', '4'=>'28', '5'=>'29', '6'=>'30', '7'=>'31' + ); + + /** + * Use padding false when encoding for urls + * + * @return base32 encoded string + * @author Bryan Ruiz + **/ + public static function encode($input, $padding = true) { + if(empty($input)) return ""; + $input = str_split($input); + $binaryString = ""; + for($i = 0; $i < count($input); $i++) { + $binaryString .= str_pad(base_convert(ord($input[$i]), 10, 2), 8, '0', STR_PAD_LEFT); + } + $fiveBitBinaryArray = str_split($binaryString, 5); + $base32 = ""; + $i=0; + while($i < count($fiveBitBinaryArray)) { + $base32 .= self::$map[base_convert(str_pad($fiveBitBinaryArray[$i], 5,'0'), 2, 10)]; + $i++; + } + if($padding && ($x = strlen($binaryString) % 40) != 0) { + if($x == 8) $base32 .= str_repeat(self::$map[32], 6); + else if($x == 16) $base32 .= str_repeat(self::$map[32], 4); + else if($x == 24) $base32 .= str_repeat(self::$map[32], 3); + else if($x == 32) $base32 .= self::$map[32]; + } + return $base32; + } + + public static function decode($input) { + if(empty($input)) return; + $paddingCharCount = substr_count($input, self::$map[32]); + $allowedValues = array(6,4,3,1,0); + if(!in_array($paddingCharCount, $allowedValues)) return false; + for($i=0; $i<4; $i++){ + if($paddingCharCount == $allowedValues[$i] && + substr($input, -($allowedValues[$i])) != str_repeat(self::$map[32], $allowedValues[$i])) return false; + } + $input = str_replace('=','', $input); + $input = str_split($input); + $binaryString = ""; + for($i=0; $i < count($input); $i = $i+8) { + $x = ""; + if(!in_array($input[$i], self::$map)) return false; + for($j=0; $j < 8; $j++) { + $x .= str_pad(base_convert(@self::$flippedMap[@$input[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT); + } + $eightBits = str_split($x, 8); + for($z = 0; $z < count($eightBits); $z++) { + $binaryString .= ( ($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48 ) ? $y:""; + } + } + return $binaryString; + } +} + |